Wasp•11mo ago

Migrate found failed migrations in the target database (Error: P3009)

I have a Wasp 0.15 web app deployed on Fly.io. After my latest deployment, the app crashed because some Prisma migrations couldn’t be applied. Now my Fly.io machine is in a stopped state, and I can’t access my app.

I get this in the server logs:

migrate found failed migrations in the target database, new migrations will not be applied. Read more about how to resolve migration issues in a production database: https://pris.ly/d/migrate-resolve

Can I safely follow the instructions from the prisma documentation or does this work differently in wasp?

I have deleted my local migrations file, ran wasp db migrate-dev and redeployed but it also didn't help.

I am not sure what the difference between staging and prod db schema is, I think it should be the same, though i changes some stuff 2 days ago for a test, but i thought i reversed that.

How can I now move on and recover from that without loosing user data?
I do have snapshots of the db.

Patching & hotfixing | Prisma Documentation

How to reconcile the migration history after applying a hotfix or patch to a production environment.

kapa.ai•2/17/25, 1:49 AM

Hi @fred-123. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:

kapa.ai•2/17/25, 1:49 AM

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Based on the information provided in the knowledge sources, I can offer some guidance on your Prisma migration issue with your Wasp 0.15 app deployed on Fly.io. However, please note that the knowledge sources don't contain specific information about Wasp 0.15 or this exact error scenario, so I'll provide general advice based on related information.

Database Migration in Production:Wasp typically runs migrations automatically on every application start in a deployed environment. However, in your case, it seems that there are failed migrations preventing this process.
Resolving Failed Migrations:The Prisma documentation you mentioned about resolving migration issues in a production database is generally applicable, even when using Wasp. However, you should be cautious when making changes to your production database.
Accessing the Production Database:To investigate and potentially fix the issue, you might need to connect to your production database. You can use the Fly CLI to do this:

fly postgres connect -a <your-db-name>

fly postgres connect -a <your-db-name>

Once connected, you can examine the state of your database and migrations 🙋questionsRunning database migrations on hosted app.

Checking Migrations:
After connecting to your database, you can check the state of your migrations:

SELECT * FROM _prisma_migrations;

SELECT * FROM _prisma_migrations;

This will show you which migrations have been applied and which ones have failed.

Recovering Without Data Loss:
Since you have snapshots of your database, you have a safety net. However, before restoring from a snapshot, try these steps:

kapa.ai•2/17/25, 1:49 AM

a. Examine the differences between your local schema and the production schema.
b. If you've made recent changes that you reversed, ensure these reversals are reflected in your migrations.
c. Consider manually fixing the failed migrations in the production database if possible.

Redeploying:
After resolving the migration issues, you can try redeploying your app. If you're still encountering issues, you might need to:

a. Delete the app on Fly.io and redeploy from scratch.
b. Restore from a database snapshot if necessary.

Future Prevention:
To prevent such issues in the future, consider the following:
Always test migrations locally before deploying.
Keep your staging and production environments in sync.
Regularly backup your database.

Remember, making changes to a production database carries risks. If you're unsure about any steps, it's advisable to seek help from the Wasp community or consider professional assistance to avoid data loss.

For more detailed information on database migrations in Wasp, you can refer to the Wasp documentation on migrating from SQLite to PostgreSQL, which provides some insights into the migration process, although it's not specific to your current issue.
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Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:
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kapa.ai•2/17/25, 1:49 AM

Sorry @fred-123, I seem to be having a bit of trouble. Don't worry though, I've pinged my support and they will try to fix me up! :technologist:

Perhaps try again in 15mins?

fred-123OP•2/17/25, 1:57 AM

@kapa.ai these migrations failed:

20250214134902_: This migration failed due to a unique index constraint violation on the User table. Specifically, the subscriptionTier column already has a value "tester" which is being duplicated. The database error code is 23505.

20250215185723_reset_db_locally_15_2_25: This migration failed because a relation (table) named "User" already exists. The database error code is 42P07. This likely means the migration is trying to create the User table again, but it's already there (possibly from a previous migration, even if that previous migration failed later).

kapa.ai•2/17/25, 1:57 AM

Let me check the knowledge base for you again. One moment! :books:

kapa.ai•2/17/25, 1:58 AM

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Based on the information you've provided about the failed migrations, it seems you're dealing with some database schema conflicts. While the knowledge sources don't provide specific information about these exact migration errors, I can offer some general advice based on Wasp and Prisma migration practices.

Unique Index Constraint Violation:For the first migration (20250214134902_), you're encountering a unique index constraint violation on the User table, specifically for the subscriptionTier column. This suggests that you're trying to insert or update a value that already exists, violating a unique constraint.
Relation Already Exists:The second migration (20250215185723_reset_db_locally_15_2_25) is failing because it's trying to create a User table that already exists. This could be due to an inconsistency between your local schema and the production database schema.

To resolve these issues, you might want to try the following steps:

Examine your migrations:Review the content of these specific migrations to understand what changes they're trying to make. You may need to modify them to handle existing data or schema structures.
Check your database state:Connect to your production database using the Fly CLI as mentioned earlier:```fly postgres connect -a <your-db-name>```Then, examine the current state of your User table and its constraints.
Manual intervention:You might need to manually resolve these conflicts in your production database. For example:
- For the first error, you may need to update or remove duplicate "tester" values in the subscriptionTier column.
- For the second error, you might need to drop the existing User table if it's safe to do so, or modify your migration to alter the existing table instead of creating a new one.

kapa.ai•2/17/25, 1:58 AM

Prisma Migrate Reset:If it's safe to do so (and you have a backup), you could consider using `prisma migrate reset` locally to reset your database and migrations. However, be extremely cautious with this in a production environment as it can lead to data loss.
Incremental fixes:Instead of applying all migrations at once, try fixing and applying them one by one. This might help isolate and resolve issues more effectively.

Remember, modifying production databases carries risks. If you're unsure about any steps, it's advisable to seek help from the Wasp community or consider professional assistance to avoid data loss.

For more information on handling Prisma migrations in Wasp, you can refer to the Wasp documentation on data model and migrations. While it doesn't address your specific error, it provides context on how Wasp handles database schemas and migrations.
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Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:
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kapa.ai•2/17/25, 1:58 AM

Sorry @fred-123, I seem to be having a bit of trouble. Don't worry though, I've pinged my support and they will try to fix me up! :technologist:

Perhaps try again in 15mins?

fred-123OP•2/17/25, 2:59 AM

Thats all i needed. Its fixed.

Migrate found failed migrations in the target database (Error: P3009)

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